December 25, 2007, 09:20:40 am
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Author Topic: 16khz audio is hugely noticable  (Read 45 times)
Redbehelit
Newbie

Posts: 5
« on: December 23, 2007, 03:34:10 pm »
Seems that the OSD records audio at 16khz. I kept wondering why setting it to 128kbps AAC kept sounding bad when some people consider 128kbps to be near cd quality. Is there a way I can boost this to at least 32khz? The sound is very bad at 16khz. I'd gladly sacrifice some kbps for higher khz.
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tn
Newbie

Posts: 19
« Reply #1 on: December 24, 2007, 03:18:30 am »
I found that we can change the audio sample rate (default 16kHz)
by editing "/mnt/OSD/.recordings"  manually.
...
vrec_samplerate=2 (=32kHz / 3=48kHz / 4=44.1kHz)
....
However the ARM processor does not have enough CPU power ( OSD's audio is software encoding),
I do not recommend to use 44.1 or 48kHz (especially when video bit rate is high (2000kbps, 2500kbps)).
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FJ
Neuros Team
Administrator
Hero Member

Posts: 581
« Reply #2 on: December 24, 2007, 01:41:53 pm »
If you increase the audio sample rate that much, you will likely have some video frame drops as the ARM will have to work extra to process the audio signal. If you keep video recording at a decent level it should be OK, but if you want to keep the default bitrate we have on the OSD, you will have to work with the default sample rate we use for audio not to have any surprises.
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FJ
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